Thermaltake Smart BM3 850W 80Plus Bronze ATX 3.0 & PCIE 5.0 Ready Semi-Modular Power Supply; 105°C/221°F Japanese Capacitor; 5 Year Warranty; PS-SPD-0850MNFABU-3
Want the best price and purchase timing?
Our AI advisor analyzes real-time pricing across all channels to find you the best deal.
AI Verdict
This 850W 80 Plus Bronze semi-modular PSU with ATX 3.0 and a 450W 12VHPWR connector is for budget-conscious builders needing modern GPU support.
This 850W PSU is a situational fit because it offers essential modern features like ATX 3.0 and a 450W PCIe Gen 5.0 connector at an entry-level price point. It's a compromise between cost and cutting-edge compatibility, making it suitable for specific budget-conscious builds.
If this isn't enough, look for a fully modular 80 Plus Gold or Platinum rated PSU with a higher 12VHPWR wattage delivery.
Regret Score™
Low RiskLower is better — measures purchase-regret risk from real buyer complaints, review credibility, and product maturity
Issues discovered after purchase
Critically weak dimension
Amazon rating vs actual quality
Chance this product isn't for you
Pros
- Includes a native 12VHPWR connector capable of delivering up to 450W for PCIe 5.0 graphics cards.
- Complies with Intel ATX 3.0 specifications, supporting up to 200% power excursion.
- Features a 120mm fluid dynamic bearing fan with a Smart Zero Fan function, keeping it silent until load exceeds 20%.
- Utilizes a high-quality Japanese 105°C main capacitor for improved durability.
- Backed by a 5-year warranty, providing coverage for an extended period.
- Semi-modular design with flat black cables helps reduce clutter inside the chassis.
Cons
- Fan noise can reach up to 63 dB under heavy system load.
- Semi-modular design means the 24-pin motherboard and CPU cables are permanently attached, which can be less flexible for cable management than fully modular units.
- 80 Plus Bronze efficiency is lower than Gold or Platinum rated PSUs, meaning more energy is converted to heat.
Dimension Scores
It's 80 Plus Bronze certified, reaching up to 85% efficiency, which is above basic but not top-tier.
The Smart Zero Fan keeps it quiet at low loads, but the fan can reach 63 dB under stress, which is audible.
It uses a high-quality Japanese 105°C main capacitor and has an MTBF of 100,000 hours, indicating decent longevity.
The semi-modular design with flat black cables is better than non-modular, but the fixed main cables limit flexibility compared to fully modular options.
Best For
- PC builds with a single modern GPU requiring a 12VHPWR connector and up to 450W.
- Users prioritizing ATX 3.0 compatibility without spending on higher efficiency ratings.
- Gaming systems where budget is a primary concern but modern connectivity is still needed.
Not Recommended For
- Enthusiast builds with multiple high-power GPUs or extreme overclocking.
- Users who demand absolute silence from their PC under all load conditions.
- Compact ITX builds where every cable needs to be detachable for optimal routing.
Watch Out For
- The fan can get noticeably loud, hitting 63 dB when the system is under stress.
- While semi-modular, the essential motherboard and CPU power cables are fixed, which some users find less convenient for cable routing than a fully modular PSU.
- Some users reported that while the unit works, they still prefer fully modular power supplies for ease of installation and aesthetics.
Full Specifications
| ASIN | B0CFWMX4R8 |
| Brand | Thermaltake |
| Series | Smart BM3 850 |
| Wattage | 650 watts |
| Model Name | Smart BM3 850 |
| Form Factor | ATX |
| Item Weight | 3.75 pounds |
| Manufacturer | Thermaltake |
| Connector Type | ATX, Molex, PCI Express, SATA |
| Cooling Method | Air |
| Output Wattage | 850 |
| Item model number | PS-SPD-0850MNFABU-3 |
| Compatible Devices | Personal Computer |
| Product Dimensions | 5.9 x 5.5 x 3.4 inches |
| Item Dimensions LxWxH | 5.9 x 5.5 x 3.4 inches |
| Item dimensions L x W x H | 5.9 x 5.5 x 3.4 inches |
What Buyers Say
Users are generally pleased that this 850W Thermaltake PSU delivers on its promise of ATX 3.0 and PCIe Gen 5.0 compatibility with a 12VHPWR connector, especially considering its price point. Many appreciate the Smart Zero Fan function, which keeps the unit quiet during light use. However, some have noted that the fan becomes quite audible, peaking around 63 dB, when the system is under heavy load. The semi-modular design is seen as a compromise, with some preferring fully modular for easier cable routing, but the flat cables do help.
“Dude, this thing actually powers my new RTX card without exploding, and it was way cheaper than the fancy ones. The fan gets a bit loud when I'm really pushing it, but whatever, it works!”
Common Praise
- The native 12VHPWR connector works as advertised for modern GPUs.
- The Smart Zero Fan function keeps the PSU silent at idle and low loads.
- Voltage stability remains within acceptable ranges even during stress tests.
- The 5-year warranty provides peace of mind.
Common Complaints
- The fan noise is noticeable and can reach 63 dB when the system is heavily utilized.
- The semi-modular design means the main motherboard and CPU cables are permanently attached, which can make cable management a bit trickier.
- Some users would prefer a fully modular design for maximum flexibility.
Ownership Tips
- The Smart Zero Fan feature really does keep it quiet for everyday browsing and light gaming.
- You'll definitely hear the fan kick in during intense gaming sessions or benchmarks.
- The fixed main cables aren't a huge deal if your case has good cable routing options, but it's not as clean as fully modular.
- The 12VHPWR cable feels sturdy and connects securely to the GPU.
Frequently Asked Questions
Does this PSU support the latest graphics cards like the RTX 40 series?
Yes, it's PCIe Gen 5.0 compliant and includes a native 16-pin (12VHPWR) connector that can deliver up to 450W, making it compatible with modern GPUs.
Is this power supply fully modular?
No, it's semi-modular. The 24-pin motherboard and CPU power cables are permanently attached, while other cables are detachable.
How quiet is this power supply?
It features a Smart Zero Fan function, so the fan won't spin until the load exceeds 20%, making it silent at low loads. Under heavy load, the fan can reach up to 63 dB.
What is the warranty period for this PSU?
Thermaltake provides a 5-year warranty for this power supply.
What does 80 Plus Bronze certified mean?
80 Plus Bronze certification means the power supply is at least 85% efficient at 50% load and 82% efficient at 20% and 100% load, converting less electricity into wasted heat compared to non-certified units.
Buying Guide
When you're looking at a power supply, you're basically picking the heart of your PC. It needs to deliver enough juice to all your components, especially your graphics card and CPU, without breaking a sweat. You also want it to be efficient so it doesn't waste too much power as heat, and quiet so it doesn't sound like a jet engine. Compatibility with newer standards like ATX 3.0 and PCIe 5.0 is key if you're building with current-gen hardware.
Wattage (850W)
This is how much power the PSU can supply. Too little, and your PC won't run stably or might not even turn on. Too much, and you're paying for capacity you don't need. 850W is suitable for most mid-to-high-end single GPU systems.
80 Plus Bronze
This certification indicates how efficiently the PSU converts AC power from your wall into DC power for your PC. Bronze means it's at least 82-85% efficient, which is a step up from uncertified units, saving some electricity and producing less heat.
ATX 3.0 & PCIe 5.0 Ready
These are the latest power delivery standards. ATX 3.0 handles transient power spikes better, which modern GPUs can demand. PCIe 5.0 readiness means it has the new 12VHPWR connector, essential for many current-generation graphics cards, preventing the need for adapters.
Semi-Modular
This refers to which cables are detachable. Semi-modular means essential cables (like the motherboard and CPU power) are fixed, but others are removable. This helps with cable management by letting you only connect the cables you need, reducing clutter inside your PC case.
Alternatives
If this doesn't quite fit, look for a fully modular power supply for maximum cable management flexibility, or an 80 Plus Gold or Platinum rated unit for higher energy efficiency and potentially quieter operation.
You Might Also Like
Micro ATX PC Case | Mini Tower Computer case | Pre-Installed 120mm*1 RGB Fan | ITX Desktop Chassis for MATX/ITX | 240 RAD | 280mm GPU | 160mm CPU Cooler Height - White S6
$0-$49This MAQUY S6 is a budget Micro ATX case with a pre-installed 120mm RGB fan, supporting 280mm GPUs and 240mm top radiators for entry-level builds.
Micro ATX Case, Mini PC ITX Desktop Computer Case MATX Case Support ATX PSU/250mm GPU/135mm CPU Cooler/1x 3.5’’HDD or 2X 2.5’’SSD/USB 3.0 Port
$0-$49This is a compact 38.5x19.5x32.5cm Micro ATX case supporting 250mm GPUs and 135mm CPU coolers, designed for budget workstation builds.
Small PC Case, ITX Mini Computer Case with 360 Degree Ventilation, 10.5L Compact Design for ITX Motherboard, SFX Power Supply, 4 x 2.5 Inch SSDs
$50-$99This 10.5L acrylic ITX case supports SFX/SFX-L PSUs, ITX motherboards, and GPUs up to 210mm, designed for compact builds.
Micro ATX PC Case | Mini Tower Computer case Support Vertical GPU Mount | Pre-Installed 120mm*1 RGB Fan | ITX Desktop Chassis for MATX/ITX | 240 RAD | 320mm GPU | 165mm CPU Cooler Height-Black
$0-$49A budget Micro ATX case with a mesh front, tempered glass, and support for 320mm GPUs and 240mm AIOs, but only one pre-installed 120mm RGB fan.